A kind of method of low pressure plasma spraying tin coating

Abstract

The invention provides a low-pressure plasma spraying method for a TiN coating. The low-pressure plasma spraying method comprises the steps: spraying Ti powder under a low-pressure condition by using a high-power plasma spray gun; and carrying out plasma spray-physical vapor deposition by taking nitrogen as a plasma working gas and a reaction gas to achieve the TiN coating. The TiN coating prepared by using the low-pressure plasma spraying method is of a columnar structure, high in component purity, fine in crystal grain, dense in structure and capable of effectively improving the performance of the surface of a workpiece. A nitriding layer exists between the coating and the workpiece, so that the bonding strength of the coating and the workpiece can be effectively improved. The low-pressure plasma spraying method is simple in process, high in deposition efficiency and suitable for rapidly spraying the TiN coating on a large area.

Description

technical field The invention belongs to the technical field of thermal spraying, in particular to a low-pressure plasma spraying-physical vapor deposition TiN coating method. Background technique As a cermet material, TiN coating has the characteristics of high hardness, high melting point and corrosion resistance, and has been widely used in cutting tools, high-temperature structural materials and anti-wear and anti-corrosion parts. Depositing TiN coating on the surface of titanium and titanium alloys can improve the mechanical properties, corrosion resistance and biocompatibility of the surface, which is beneficial to the application of titanium and titanium alloys in aerospace, ship weapons, petrochemical, biomedical and other fields. Applications. At present, the preparation of TiN coatings at home and abroad generally adopts coating processes, such as physical vapor deposition and chemical vapor deposition. These methods produce pure, dense TiN coatings. However, i...

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Problems solved by technology

Therefore, although the general plasma spraying process can effectively improve the deposition efficiency of TiN coating, it is difficult to obtain a pure, non-oxidized and dense TiN coating.

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